The only time he scares me is when I clip his claws, when I hold his paw and he sees the clippers,he eyeballs me and goes grrrrrrrh.
I put the muzzle on for that task,all other times he's cool.
He is very protective of me,that's why he wears the muzzle whenever he leaves the house.If someone approaches me to quickly he will get aggressive. It's a shame,we have tried everything to train it out of him but to no avail.
Better to keep him muzzled that way no one can get hurt.
At home he's a big softy.